bundle2: move the 'close' method off the unpackermixin
This method is unrelated to unpacking and only used by the unbundle20 class.
We move it there for clarity.
FROM fedora:21
RUN yum install -y gcc
RUN yum install -y python-devel python-docutils
RUN yum install -y make
RUN yum install -y rpm-build
RUN yum install -y gettext
# For creating repo meta data
RUN yum install -y createrepo